You can save yourself some trouble at this point and skip the rest of the disassembly: See that green tab to the left of the sd card slot? THAT’S the wifi board (and that green tab, in hindsight, seems designed to make it accessible without taking apart the whole device, don’t you think?) A little careful spudging, and you’ve got it out, ready to replace! (There’s a guy who shows the process on youtube, if you want to review first)